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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd5a8b687cbf8f4b9c8d5faf613e8cf797f2ad6e557ccc6ef9e7e553cf22688b' 
  AND token = 'rcIgBQojpC43gw87OFKEBTECVdkFRO/INz1RVXoprv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}